getop_example_c++

#include <iostream>
#include <signal.h>
#include <getopt.h>

using namespace std;

char * __PORT = 0;
int PORT = -1;

void dbg(const char * str) {
        cout << "dbg: " << str << endl;
}

void finish(int __ignore) {
        dbg("quitting program");

}

int main(int argc, char* argv[]) {

        signal(SIGINT, finish);
        struct option const long_opts[] = {
                {"port", required_argument, NULL, 'p'},
                {0,0,0,0}
        };
        int c;

        // :p means this command line arg has a parameter passed behind it
        while ((c = getopt_long(argc,argv, "p:", long_opts, 0))!=-1) {
                switch(c) {
                        case 0:
                                break;
                        case 'p':
                                __PORT = optarg;
                                break;
                        default:
                                cout << "got a default case: " << c << endl;
                                break;
                }
        }

        if (__PORT) {
                PORT = atoi(__PORT);
                cout << "info: port is: " << PORT << endl;
        }

        return 0;
}